0020111744_00 - 09/10 - Glow-worm
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MAINTENANCE
Fault
codes
Description Cause Solution
526
Evaporation/condensation
temperature sensor failure
The sensor is defective or is not
correctly connected to the main
PCB.
Check the sensor’s connections.
Check that the position and the operation of the sensor are correct.
Check the sensor’s resistance.
528
Plate to plate heat exchanger
temperature sensor failure
532
The brine circuit fl ow is too
low (<500 l/h) .
Blocking failure if produced
more than 3 times.
The brine circuit fl ow is too low.
Force the pump and check the fl ow.
Adjust the water fl ow by changing the speed of the pump or opening
the hydraulic module control valve.
There is a lack of water.
Check the brine circuit. If the valve leaks, replace the valve, add water
and degas the circuit.
Anti-silt fi lter missing or clogged
in the brine water circuit’s
backfl ow.
Install an anti-silt fi lter.
Clean the anti-silt fi lter.
The circuit was not properly bled. Activate the bleeding function and top up the glycol water if necessary.
The expansion vessel is
defective.
Check the pressure of the expansion vessel.Reinfl ate the expansion
vessel.
Replace the expansion vessel.
534
The output temperature of the
circuit brine is too high
(> 57°C).
Non-blocking failure.
The sensor is defective or is not
correctly connected to the main
PCB.
Check the sensor’s connections. Check that the position and the
operation of the sensor are correct.
Check the sensor’s resistance.
Faulty indication of water fl ow. Check that there is no water fl ow by closing a valve in the brine circuit.
The expansion vessel is
defective.
Check the pressure of the expansion vessel.
Reinfl ate the expansion vessel.
Replace the expansion vessel.
Anti-silt fi lter missing or clogged
in the brine water circuit’s
backfl ow.
Install an anti-silt fi lter.
Clean the anti-silt fi lter.
Air in the brine water circuit Drain the brine water circuit
536
The compressor discharge
temperature is too high
(> 105°C).
Blocking failure if produced
more than 3 times.
There is an excess or a lack of
refrigerant.
Measure the air and water’s ΔT. If it is very low (<2K), lack of fl uid
may be the cause (loss of heat output). Measure the real overheating
(must be <7K in heating mode). Measure the electrical current with an
ammeter. If the current is below 4.5 amps, the cause may be a lack of
fl uid.
Check the pressure with a monometer.
Check that there are no leaks, repair them if necessary.
Adjust the amount of refrigerant.
The temperature sensor is
defective or is not correctly
connected to the main PCB.
Check the connections from the sensor to the discharge. Check that the
position and the operation of the sensor are correct. Check the sensor’s
resistance.
The water fl ow sensor is
defective.
Check absence of water fl ow by forcing the pump. Consult the
"Adjusting the HP fl ow circuit” chapter.
Pre-expansion in the liquid line
(load loss)
Check the appearance of the condenser output tubes leading to the
evaporator (do not pinch).
The electronic expansion valve is
defective.
Check that the motor is correctly clipped to the regulator.
Check that the electronic is working correctly, if this is not the case:
Check the winding resistance.
Replace the motor.
Replace the electronic expansion valve, check that there are no leaks.
Scale on the plate to plate
exchanger.
Clean the heat exchanger plates.
The heating outlet and return
temperature sensors are
defective.
Check the sensor connections.
Check that the sensor position and operation are correct.
Check the sensor resistance.
The air temperature is too high in
cooling mode.
Check the agreement between the outside sensor and heat pump air
inlet temperature sensor.
Check that the heat pump air inlet temperature sensor is working
properly.
In de-icing mode, the de-icing
sensor is defective or misplaced.
Check the sensor connections.
Check that the sensor position and operation are correct.
Check the sensor resistance.
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